not riding pants. They are meant for sitting in a saddle. The legs are open.Look more for ski pants or tight jeans. As I can't see any darts maybe they are done from ponte but the pics are very smalllgposaune

"Nur der ist Meister seiner Kunst, der immer sucht, das Gute zu verbessern und niemals glaubt, das Beste schon zu haben.""Only he is a master of his art who always seeks to improve the good and never believes to have the best already"

There are shaped waistbands - and some sort of yoke at the black/white item. That's ok for a flat-bellied lady or a customer with a protudent stomach. If your customer is an hour glass you may need waist darts, too, which can be transformed into a yoke.
I would also recommend a belly control panel at the inside.
You need to reduce the hip width according to the fabric you use. As a rough guide you can take away half of the stretch of the fabric but you can determin that at a fitting only. (If you have two layers of fabric start a third of the stretch.)
Don't reduce the leg width for this will lead to legs climbing up with every movement.
As for the waist you have to try. I usually don't reduce the waist in order to avoid the "muffin edge" that goes with softer tissue but some fabrics need that, too.

You need to reduce the hip width according to the fabric you use. As a rough guide you can take away half of the stretch of the fabric but you can determin that at a fitting only. (If you have two layers of fabric start a third of the stretch.)

Yes Eboli thank you so much! I had this piece of info forgotten. I will use it.

So also my thanks for Posaune and der Schneidergott I will use darts in the yoke and will start to draft a jeans pattern for the lady, instead of the riding pants. Thank you